Word Count : 205

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The Bell numbers (B_n) count the number of ways to partition a set of (n) elements. They can be computed using the recurrence relation: [ B_{n+1} = \sum_{k=0}^{n} \binom{n}{k} B_k ] with (B_0 = ____ __________ ________ _________ _________ ____ _________ _______ _____ ____.
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